The mommy mogul admitted at her dad Joe Simpson’s holiday party that she’s pregnant with her second child, Celebuzz can exclusively reveal.

The Fashion Star judge, who attended the private function with her fiance Eric Johnson, has remained tight-lipped about reports that she’s expecting again, but she couldn’t contain her joy any longer at the annual festive bash Dec. 11.

What did the new mom say?

“As Jessica and her husband were about to leave the party somebody asked her, ‘How’s the baby?’ and she boasted, ‘Which one?! I’m pregnant again!’” One party-goer told Celebuzz but asked not to be identified because she is known to the family. “She was so happy, smiling and giggling.”

According to the eyewitness, the evening affair – which was also attended by Jessica’s younger sister Ashlee Simpson, 28, and her ex-beau, Ryan Cabrera, 30 — took place at Papa Joe’s beachfront house in Santa Monica, where he uses the seasonal soiree to highlight the up-and-coming artists under his management.

“It was a private affair for around 50 people made up of friends, family and producers,” said the party-goer. “Joe uses it as an opportunity to showcase all his talented artists by playing all their music, and they can mingle and have some fun.

The onlooker revealed that the 32-year-old mother seemed delighted with her second pregnancy, which comes just seven months after she gave birth to her first child, daughter Maxwell.

But while various people offered their congratulations, the proud parents couldn’t hang around. The reason: They had to dash off to a party being hosted by Jessica’s mom, Tina, who filed for divorce from Joe in October after 35 years of marriage.

“I’m running late, I’ve got to go to my mom’s,” a beaming Jessica revealed to the guests before leaving with her 33-year-old husband-to-be.

And the blonde bombshell was able to cover any signs of a growing baby bump under her big jacket.

The “With You” songstress, who admitted to struggling to lose the weight post-baby, has been at the center of speculation for weeks ever since US Weeklypublished a cover story alleging she had gotten pregnant again.

Jessica, who didn’t confirm her first pregnancy for months, has yet to comment on the report.

What do you think – should Jessica Simpson finally go public about her baby news?

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What is going on, I can’t keep the story straight. Last week, you reported that Jess cut tie and refused to talk to her dad. Today, you report she went to her dad party on 12/11. Someone needs to keep their story straight.

Guest

Wow her face looks horribly fat. Looks like a dude.

davenport

I like her face, her lips look like they would feel so great on the C*CK

guest

jessica is a disgusting sow

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